UNIT TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
2. ALL LAMPS FAIL TO LIGHT, ARE DIM, OR FLICKER - CONTINUED
Repair broken or faulty connection between the rear dolly frame and
ground wire 90 in the rear harness (page 4-61).
3. ONE OR MORE (BUT NOT ALL) LAMPS FAIL TO LIGHT, ARE DIM, OR FLICKER
Step 1. Check switches, fuses, and circuit breakers in the towing vehicle.
Replace bad switches, fuses or reset tripped circuit breakers (refer to applicable
TM). If fuses and circuit breakers are good, go to step 2.
The following references are needed for step 2:
Composite light information (page 4-52) and schematic diagram (page 4-38).
Step 2. Check for faulty lamps or corroded lamp sockets.
Replace faulty lamp(s). If lamp(s) are good, leave the composite lights(s)
disassembled and go to (b).
Clean corroded lamp sockets. If sockets are clean, go to step 3.
Step 3. Check the wiring circuit that powers the affected lamps(s) for continuity between the
intervehicular cable (front harness), junction box, resistors (as applicable), interdolly
cable, rear harness, and through the composite light assembly (page 4-57).
Repair open circuit in wiring (page 4-61).
Replace faulty composite light (page 4-52).
Replace open resistors (page 4-44).